Use of Boxplots for Process Evaluation
作者:
IglewiczBoris,
HoaglinDavid C.,
期刊:
Journal of Quality Technology
(Taylor Available online 1987)
卷期:
Volume 19,
issue 4
页码: 180-190
ISSN:0022-4065
年代: 1987
DOI:10.1080/00224065.1987.11979063
出版商: Taylor&Francis
关键词: Boxplot;Control Charts;Outliers;Resistance Statistics
数据来源: Taylor
摘要:
The use of boxplots in place of single points in a quality control chart can provide an effective display of the information usually given in X̄andRcharts, show the degree of compliance with specifications and identify outliers. An example from a process evaluation illustrates the use of the proposed boxplot chart and compares it to the customary X̄andRcharts. To achieve a degree of robustness, the present paper compares several resistant measures of location and dispersion in terms of their efficiency for data from the normal, double exponential and“one-out”distributional situations. The results indicate that the mean and range of the middle half of the sample (suitably defined) combine to yield a boxplot chart with good statistical properties. For each pair of location and dispersion measures studied, a table gives the necessary factors to construct control limits.
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